Crankshaft grinding device



Oct. 16, 1951 J. STODGELL CRANKSHAFT GRINDING DEVICE 2 SHEETS-SHEET 1 Filed Sept. 19, 1949 INVENTOR.

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James asfodgell adywq FMW Fig. 2

Oct. 16, 1951 c, STQDGELL 2,571,779

"CR'ANKSHAFT GRINDING DEVICE Filed Sept. 19, 1949 2 SHEETS-SHEET 2 mes C. Stodge/l Fig. 3

IN VEN TOR.

Patented Oct. 16,1951

CRANKSHAFT GRINDING DEVICE James C. Stodgell, Dalton, Mo., assignor of fifty per cent to J. W. Hayward, Dalton, Mo.

Application September 19, 1949, Serial No. 116,437

This invention appertains to a shaft grinding tool and has for its primary object to grind and true the crank pins or throws of a crankshaft without removing the shaft from its bearings in the engine.

Another important object of this invention is to provide a sectional casing, which is adapted to be clamped around a shaft, and within which is rotatably housed a pluralityof adjustable grinders, these being provided for unitarily driving the grinders on the shaft.

Another important object of this invention is to provide means for adjusting the individual 2 Claims. (Cl. 51241) grinders held in a circular arrangement relative to each other and adapted to be rotated around the shaft, the grinders being adjustable for grinding different diameter shafts.

These and ancillary objects and structural features of merit are attained by this invention, the preferred embodiment of which is set forth in the following description and illustrated in the accompanying drawings, wherein:

Figure 1 is an exploded perspective view of the grinding device and actuating means therefor, the latter including a conventional electric drill;

Figure 2 is a fragmentary front elevational view of a conventional crank throw, illustrating the grinding device operatively clamped thereon;

Figure 3 is a longitudinal vertical sectional view taken on line 33 of Figure 2 Figure 4 is a transverse sectional view taken on line 44 of Figure 3, and,

Figure 5 is a fragmentary sectional view of the means provided for individually mounting and adjusting the grinders on a common support.

In the accompaning drawings, the grinding tool in includes a casing l2, which is formed from a pair of semi-circular or arcuate sections I4 and I6. Each of the sections includes a pair of arcuate plates l8 and 20, which are connected together in spaced relationship by transversely positioned rivets 22 having sleeves 24 concentrically disposed on the shank thereof for spacing the plates laterally apart. Of course, any common type of fastening means may be provided for se- Thus, plate segments 26 are pivotally positioned between the abutting ends of the complementary plates of each of the sections, the plates being disposed adjacent the outer periphery of the arcuate plates and adapted to receive transversely disposed fastening bolts 28.

Common supporting and driving means 30 is provided and is rotatably housed within the sectional annulus, the means including a split annular ring 32 having an upstanding annular rim 34 integrally formed on its outer periphery, the rim being spaced inwardly from the opposing faces of the ring to form opposing outwardly facing shoulders 36 and 38. The shoulders 36 and .38 are adapted to ride on the inner edges of the casing sections, as seen in Figure 4. Gear teeth 40 are mounted on the periphery of the rim by means of a flange 42 seated in a circumferential slot in the rim. 1 The sections of the split ring 32 are detachably secured together by opposing arcuate plates 44 and 46, the opposing ends of the plates being secured together by transversely disposed screws 48.

The casing section [6 is formed with a tubular housing 52, which extends from the enlarged portion 50 on the rounded end of the section, the

' tubular housing being tangently related to the curing the plates together in spaced complemensection. A worm gear 54 is rotatably journaled within the axial passage in the housing, the gear being formed on a shaft 56 mounted for rotation in the housing and having one end 58 projecting from the housing and terminating in a notched or grooved end 60 for receiving a driven member or screwdriver shank 62 fixed in the shaft 64 of a conventional electric drill 66.

A plurality of circumferentially spaced radially disposed internally threaded openings 68 are formed in the inner circumference of the split ring 32. Threaded lugs 70 are received in the openings and are provided with axial passages 12 for receiving supporting pins 14. The supporting pins are held in the passages by means of stop collars '16 secured to the inner ends thereof and seated on springs 78 disposed in the inner ends of the openings and interposed between the inner end of the lugs and the inner ends of the openings. Supporting shoes 80 are transversely formed and positioned on the outer ends of the pins 74 and are provided with vertically extending flanges 82, the flanges projecting from one of the marginal edges of the shoes. The flanges are provided to receive one of the edges of abrasive blocks, which are mounted on the outer faces of the shoes by suitable securing means, such as adhesive or the like. It is to be noted that the abrasive blocks or elements 84 include alternately arranged stones 86 and wooden blocks 88.

Means is provided for preventing rotation of the pins and shoes and preferably includes a locking pin 90, which extends downwardly from the shoes and is received in a Vertical opening 92 formed in the ring 38, parallel to the threaded bores or openings 68.

In use, the housing sections are spread apart by unlocking the segment plates 26, removing the fastening bolts 28, the sections swinging open about the plates 26. The sections of the split gear are unfastened and swung in arcuate paths with the casing sections, the gear unit and casing sections being positioned on a crankshaft. It is to be noted that the shaft is in its normal position with respect to the engine of the vehicle. The casing sections are then clamped together by the fastening mean 28 to securely clamp and lock the grinding unit on the shaft. By means of the electric drill or similar portable driving means, the worm gear is rotated to impart rotary movement to the common supporting member for the individual grinders. As the gear and ring rotate, the grinders are rotated about the shaft grinding and truing the same.

or course, for use on shafts of various diameters, the grinders may be individually adjusted by rotating the bolts or lugs H3 in the threaded openings 58 to arrive at the desired placement of the shoes and abrasive elements carried thereby, with respect to each other and with respect to their circular arrangement.

Thus, it can be seen that a compact and sturdy grinding tool is provided, which can be easily and conveniently employed for grinding and truing shafts of various diameters, without necessitating the removal of the shaft from their operative association with various machines or engines.

Having described the claimed as new is:

1. In a shaft grinding device, the combination of an annular supporting member provided with a set of circumferentially spaced radially extending screw-threaded bores, a set of studs rotatably positioned in and projecting inwardly from the respective bores and having threads interengaging the threads of the bores whereby the studs may be adjusted radially of said member, abrading units provided at the inner ends of said studs, said studs being provided with axial passages, support pins rotatably positioned in said passages and carrying said abrading units, and locking pins provided on and radiating outwardly from the respective units, said supporting member being provided with radial openings having outer end portions of said locking pins slidably disposed therein, whereby to sustain the abrading units against rotation.

2. The device as defined in claim 1 together with collars provided in said bores on said sup port pins and engageable with adjacent ends of the respective studs, whereby'to prevent the support pins from sliding inwardly through said passages.

invention, What is JAMES C. STODGELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 899,536 Jacobs Sept. 29, 1908 1,928,506 Sellberg et a1 Sept. 26, 1933 2,162,187 Tharf June 13, 1939 2,201,664 Ferguson May 21, 1940 2,245,435 Dondinean June 10, 1941 2,291,164 Law July 28, 1942 

